Automatic spring-valve cut-off



V 'J. L. MITCHELL. AUTOMATIC SPRING VALVE GUT-OFF. N0. 292,758.

(No Model.)

'PatentedJan. 29, 1884.

jnvenwf T Vunesses JAUZOI *1 '1 5/ the invention, Figure l is a view of the work- UNITED STATES PATENT OFFICE.

JONAS L. nironntt, or LOGAN, OHIO.

AUTOMATICHSPRING-VALVE CUT-OFF.

SPECIFICATION forming part of Letters Patent No. 292,758, dated January 29, 1884.

ApplicationfiledAugustfl,-18F3. (X model.)

To all whom it may concern.-

Be it known that I, JONAS L. MITCHELL, a citizen of the'United States, residing at Logan, in the county of Hocking and State of Ohio, have invented certain new and useful Improvements in Automatic Spring- Valve Out-Offs, of which the following is a specification.

My invention relates to an automatic cut-off for valves, which is here shown applied to a compressed-air water-elevator.

In the drawings annexed, which illustrate ing parts of the valve and cut-off. Fig. 2 is aview of a water-elevator wherein compressed air is the medium employed forraisingthe "water, and showing the valve and cut-off applied to regulate the action of the compressed air. Fig. 3 shows the rod and tumbler. Fig. 4 shows a view of the valve-rod. Fig. 5 shows a modification in the valve-rod.

The letter A designates the valve-chamber; B, the inlet-port, (in this instance for the compressed air,) and O the outlet-port. The valve D reciprocates, so as to cover alternately 'first one and then the other of these ports. The valve is a cylinder open at both ends. In the present device the reciprocation of the valve is vertical, and to assist in the upward motion a lifting-spring, e, is provided. Three annular grooves, f and f, are turned out 011 the inner side of the valve-chamber. The cen ter one, f, allows oil from the oil-cup g'to pass around the said chamber, thereby lubricating the valve. Connecting with each of the other annular grooves is a groove, 7, one of which extends far enough to reach beyond the stroke of the valve D at one end, and the other one reaches beyond the stroke of the valve at the. other end. The valve-cylinder slides across the annular grooves, and the other grooves give access of air to the annular grooves,t hus allowing the compressed air to pass around and thereby so equalize the pressure as to enable the valve to move easily. The chest I incloses the cut-off mechanism, which shifts the valve, .and in operation the compressed fluid fills this chest. In Fig.1 one side of the chest is removed to expose the parts. A trip-lever, 7c, is pivoted at Z, and has a throw or movement indicated by broken lines. One

be instantly thrown to the opposite side.

. end is j oin'ted at lto a rod, 2, which has play cndwise freely through a tumbler or rock shaft, m. The end of the rod close to the joint with the trip-lever is threaded, andhas a nut, 3, and a spiral spring, 4, around the rod, and has one end resting on the tumbler and the other against the nut. ables the spring to be readily tightened, so as to cause it to exert greater pressure on the trip-lever. \Vhen, in the throw oi the triplever, both the rod 2' and trip-lever are in such position as to form asingle straight line, the trip-lever may be said to be on its deadcenter, and the slightest additional movement then will allow the spring 4 at once to have action, and the trip-lever will therglby l1- asmuch as the free end 7c of the jointed triplever may have movement to a position at each side of the'point where its dead center occurs; I describe it as having a two-throw,

This arrangement enboth throws being made by one and the same spring. A rod, 01., is attached to the valve, and moves endwise in a suitable guideway, and a stop device, a, is provided to limit the movement of the rod. Two pins, 5, are fixed to the rod, and the space between the pins shows the extent of movement or throw of the free end or the trip-lever, because it is against these pins that the trip-lever strikes. The rod may be slotted, as shown in Fig. 4, with a pin at each end of the slot,'and the free end of the trip-lever will have its throw in the slot. Each pin may have a friction-roller about it.

Instead of a slot and pins, the rod may have shoulders formed on one side at the same point where the pins are shown, as in Fig. 5. The lever would then strike against the shoulders. When the free end of the lever is moved upward, and instantly upon passing the deadcenter, it will be thrown against the upper pin, 5, and thereby the valve will be quickly moved to open the inletport and close the outlet-port. full port instantly. A rod, 1), is attached to the float Q, and moves endwise, and has a stop, 19, to limit its movement. This rod is provided with pins 6, and is otherwise constructed like and operates in connection with the trip-lover, same as the other rod.

Its promptness in moving gives a The mechanism heretofore described, not iueluding the float, constitutes the automatic cutofl' as arranged to operate a valve. It may be used for various purposes on pneumatic pumps, steam-pumps, boiler-feeders, (cc. Fig". 2 shows its application to a compressed-air water-elevator or pneumatic pump.

The letter It designates a close water-chambet; S, a receptacle at one side. which contains the simply-water, or into which the supply is received.

tis a valve to allow the water to enter the chamber, but prevents its return.

a designates the outlet-pipe, through which the water is forced. The lower end of this pipe is near the bottom of thewaterchamber.

o is a check-valve in the pipe, to prevent the water from returning to the chamber.

A pipe, 10, connects the chest I of the cutoff and the water-chamber, and the float Q, in the chamber is connected with the rod in the chest by means of another rod, p, which passes through the connecting-pipe 11'. The float must have weight sufiicient to draw the free end of the trip-lever down. \Vhenthisniovelnent takes place, the trip-lever will,-instantly upon passing its dead-center, be thrown against the lower pin, 7;, and thereby the val ve I) will be moved to close the air-inlet port and open the outlet-port.

The operation of the valve cut-oft and watcr-elevatoris as follows: The float being down, the supply of compressed air (from any source) is cut off by the closed port B. Water may nowenter the chamber '1, while the air cseapes by the open outlet-port t. The water will raise the float, and thereby move the triplever. 'The entrance of water will continue and is not checked until the trip-lever passes its dead-center, when instantly the throw of the lever will shift the valve, thereby opening' the inlet-port and closing the outlet-port. The compressed air then enters the chest and passes down the pipe 10 to the water-chamber. The valve 2, in consequence of the pressure, closes, and the pressure of air on the water threesthclatteroutthroughthepipeu. \Vhen,

by the lowering of the water in the chamber, the float has drawn the trip-lever down so far that it passes its dead-center, the valve will be again shifted, this time closing the inlet-port, thereby cutting off the supply of compressed air, and also opening the outlet-port, whereupon water will again flow into the chamber. This operation will continue and be repeated automatically as long as a supply ofcompressed air is furnished.

Having described my invention, I claim and desire to secure by Letters Patent of the United States- I 1. Cutoff mechanism for valves, consisting of a pivoted trip-lever, a rod jointed to one end of the tripdever and adapted to play endwise, and a spring whereby the trip lever may throw each side of the dead-center point, substantially as set forth.

2. Cutoff mechanism for valves, consisting of a pi voted trip-lever, a tumbler or rock-shal't, a rod jointed to one end of the lever and pass ing freely through the tumbler, and a spring, substantially as set forth.

3. The combination, with a valve, of a pin oted trip-lever having one end jointed to the end of a rod, a spring to exert pressure on the rod toward the lever, and means to connect the other end of the trip-lever with the valve, as set forth.

4. The combination ofawater-chamber having an inlet and outlet, each guarded by a valve, a compressed-air supply-pipe, an inlet and outlet port for the air, a valve adapted to alternately open and close the said air inlet and outlet ports, a float in the water-chamber, a trip-lever jointed to a springrod and adapt ed to throw both ways, and rods to connect the valve and float with the tri p-lever, substantially as set forth.

In testimony whereof I affix my signatu rein presence of two witnesses.

.TOXAS L. M I TUHETAL.

\Vilnesses:

LLovn Mvnns, CHRIS. NILL. 

